Air navigation : অকাশ পরিবহণ; বিমান চালন;
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Appropriate Prepositions
Arrange for(ব্যবস্থা করা): We have arranged everything for our study tour.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Suffer from (অসুখে ভোগা, কষ্ট পাওয়া): He has been suffering from fever for last three days.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
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Idioms
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Short temper (রগচটা)— He is a man of short temper.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.